P-200 System

Unigy System

Pump Used

316SS M03 Hydra-Cell Pump

316SS M03 Hydra-Cell Pump

Gearbox

The P200 utilizes a gear box to reduce the motor size required.  When you control flow with a standard variable frequency drive by controlling the motor RPM, the torque required for reduced flows is characteristic of higher horsepower motors.  Using a gear box to mechanically reduce the RPM enables you to use a lower horsepower motor.

The Unigy system precise torque control & feed-forward algorithms regulates torque & velocity up to 8,000 times per pump revolution and therefore a gearbox is not required

Electronic Drive

• The MD65 Micro Drive will enable a flow range of 0.02 to 1.205 LPM based upon the stated 19.1 GPH flow rate and 60:1 drive rating.

• This drive has up to a 10% variation on torque and speed

• Obtaining data readouts such as flow rate, operating pressure or other readouts is time consuming/difficult.  At a minimum it requires extensive programming and debugging, plus incorporation of sensors/transmitters in the plumbing (added cost)

• The MD65 is a universal variable frequency drive that can be applied to many types of motors and applications.

• The Unigy drive will enable a flow range from 0 to 6.8 LPM, there is no limitation within this flow range.

• The Unigy system provides significantly more precise control of the shaft torque and speed.

• Obtaining readouts and performance data such as flow rate and pressure are easily retrieved.  The Unigy can be programmed to maintain a specific discharge pressure (indicating the resulting flow) as well as to provide a specific flow (indicating the resulting pressure).  This flow/pressure “analysis” is pre-programmed into the Unigy drive based specifically upon the torque curve of the M03 Hydra-Cell Pump

• The Unigy drive is a customized drive designed around the specific requirements of the M03 Hydra-Cell Pump.

Pulsation Dampener

The P-200 system will usually utilize a pulsation dampener due to the nature of a variable frequency drive like the MD65.  As the pump shaft speed changes, the torque on the pump shaft changes and this contributes to pulsation; the dampener reduces this pulsation.  It is unclear how a pulsation dampener would affect a closed loop pressurized system.

The Unigy System does not require a pulsation dampener because of the torque control & feed-forward algorithms that are the basis for the Unigy design.  This simplifies the system design (eliminates sensors/controls), promotes purity of the fluid and does not interfere with the flow dynamics of the circulation velocity.